noun 1. an imaginary line or one drawn on a map connecting all points of equal depth below the surface of a body of water. 2. a similar line for indicating the depth below the surface of the earth of an aquifer or the top of the water table. /ˈaɪsəʊˌbæθ/noun 1. a line on a map connecting points of equal underwater depth

[ahy-suh-bront] /ˈaɪ səˌbrɒnt/ noun, Meteorology. 1. a line on a weather map or chart connecting various points where a given phase of thunderstorm activity occurred simultaneously.

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